Timer



A. S. GOLDSTEIN ET AL Juhe 16, 1925.

TIMER Filed Feb: 17. 1923 Insulatio =EIIE== V contact Patented June 16,1925.

UNITED STATES 1,541,941 PATENT OFFICE.

ABRAHAM s. GOLDSTEIN Ann Annxrsr. DAVIS, or BALTIMORE, MARYLAND, As-SIGNORS TO THE roan DUPLEX TIMER. AND'ACCESSORIES COMPANY, or BALTI-norm, MARYLAND, A CORPORATION or MARYLAND.

I TIMER.

Application med February 17,1923. Serial No. 619,580.

To all whom it may concern:

Be it known that ABRAHAM S. GoLns'rEIN and Annxrs P. DAvIs, citizens ofthe United States, residing at Baltimore, in the State of Maryland, haveinvented certain new an useful Improvements in l imers, of which thefollowing is a specification.

This invention relates to improvements in timers or circuit closers andis particularly directed to a timer device formaking and breaking thecircuit in an ignition system of an internal combustion engine.

The main object of the invention is to provide an improved timer whereinthe ignition circuitfor each spark may be closed at a plurality ofcontact faces and without multiplying wire connections, whereby aclosing of the circuit may be assured at one or the other of the facesof each contact device.

Another object of the invention is to provide an improved rotor having aplurality of contact'devices together with a series of stationarycontacts in the timer, each of said stationary contacts being providedwith a plurality of contact faces and one face of a contact beingengaged by one rotor-contact device while another face of the samecontact is simultaneousl engaged. by another of the rotor-contact eviceswhereby a plurality of contact points will be simultaneously providedbetween the rotor and each timer contact.

A still further object of the invention is to provide a rotor having aside contact and a bottom contact each in electrical connection with theother, and to further provide a stationary structure wherein eachcontact has a side contact surfaceand a bottom contact surface, wherebywhen one contact of the rotor engages the side contact of a stationarycontact the other contact on the rotor will simultaneously. engage thebottom contact surface of thesame stationary contact. I

Another object ofthe invention is to pro vide an improved constructionof rotor for circuit closers wherein a pivotally carried of they rotoris so balanced as to maintain a substantially uniform outwardpressure'regardless ofthe. variations in the centrifugal force set up bythe speed of the rotor.

With these and other objects View, the

w Ftntmmmurma. v i I M a i "Ma invention is illustrated in theaccompanying drawing, wherein,

Fig. 1 shows the improved timer as viewed from the rear or inner contactside thereof,a portion ofthe rotor-disk being broken away.

Fig. 2 illustrates the casing of the timer in cross-sectionaldetail,-the section being taken on the line 2-2 of Fig. 1. i

Fig. 3 shows a cross-sectional detail through the complete device,thesection being taken on the line 3-3 of Fig. 1. I

Fig; 4 shows an outer face view of the detached contact-carrying disk ofinsulation.

Fig. 5 illustratesthe improved rotor disk and its pivoted contact headin front elevation.

Fig. 6 shows the same in cross-section, the section being taken on theline 6-6 of Fig. 5. I

Fig. 7-shows the detached rotor in edge view, and

Fig. 8 illustrates one of the detached double-face stationary contactsin perspective.

Referring to the drawing the numeral 9 designates the outer end of thetimer shaft on which the rotor is rigidly mounted soithe latter willrevolve and travel through a circular path as the shaft revolves.The'construction of this rotor will presently be fully explained.

Around the-shaftend is located a timercasing which latter has a circularshell 10 with a dome-shaped outer covering 11 from which latter a shortnozzle 12, extends. This nozzle opensor communicates with the'im teriorof the dome as clearly:shown inFig. 3 of the drawing so thata setofignition wires 13, may be passed through the nozzle tothe interior ofthe dome as and for a purpose that will presently be explained.

On the interior of the timer-casing there is provided a circular disk orpartition 14 of insulating material, such as fibre, which latter is sopositioned as to form a vertical partition which separates theinteriorof the circular shell v10 from the interior of the dome-part 11.i

This partition 14, has a central annular flange 15 which projectsrearwardly into thecircular shell-part. v

The partition 14 has a beveled edge'to By reference to 8 of the drawing,

which shows one of the detached stationary timer-contacts,,.itywill .beynotedthat said device has one contact face 16; another contact, face 17and an arm 18. The contact face 16 ispreferably flat while the face 17iscurvedand extends at a rightangle with respectto the flat face 16 andthe arm 18 is practically a continuation otthe face 17 but narrower thanthelatter.

It will also-be noted that the curved contact (face 17 projectslaterally from the tlat contact face in one direction while the arm 18projects from the flat contact face in a reverse direction, and, thatboth faces and the arm areformedrfrom a single integral piece of metal.

These timer contacts are each embeiilded in the partition ll-and itsannulurllange 15 so that the flat face 16 of a contact will liesubstantially flush with the straight vertical face of the; dislnwhilethe curved face 19 of the same contact will be substantially flushwiththeouter circumference ofthe annular flange 15. This means that eachtimer contact will present two stationary 16. and, a side contactsurface 17 bothof w-liiclrsurfaces are integral with the arm 18.

In practice. the disk 41=.ind its annular flange are lllOllflGdflYllll'the several contacts embedded therein. and in this instance, thearm 18of each contact passes through thedisk and is exposed at the rear orinner face 20, of the disk as shown-in Figs; and 1 of the drawing.

The exposure. of the arms 13 of the. timer cont-acts atthe inner face ofthe diskenables the ig ition wires to be readily attached thereto iiithe dome side of the timer-casing as shown in Fig. 3.

ln thepresent instance four contacts are provided in the timer-casingand four igni tion wires 13 are also provided,it being necessary toprovide butonewire for each timer-contactirrespective of how manycontactfaces each contact may. have because both faces of the contactare formed from a single piece of metal.

contact surfaces 16and 1T oneof which is at The rotor. which isseparately shown in Figs. 5-6 and T of the drawing. comprises a circulardisk that is carried on a hub 29. This hubsnuglya iilsand is rigidlvattached to theiouter. end of the tiiacr-:-.1ha'ft t so .tlltlt bothi'tthehulranrl :the disk, will revolve with the shaft.

' The diameter of the disk 21 is such that its periphery will liecomparatively close to the inner circumference of the annular sh. ll 10in which it will revolve. as clearly shown in Fig. 3 of the drawing. andwhen in. place. the disk will travclin a vertical plane a the inner orrear end of the annular fiance 15 of the insnlatoralisk and perform auseful-function that will presently be explained.

Near its periphery, the disk carries a tubu-lar stud 23 which latterprojects horizontally-fron'i one side of the disk and extends outwardlytoward the inner side of the insulation-disk 14.- Thistlll)lll2ll'.Stllfl' forms a socket for a plunger-contact 2-? whichlatter is kept pressed outwardly by means of a coiled spring Theposition of this plunger contact 24'is such that asv it is carriedaround by the disk or rotor 21, it will sweep successively over theflatstationary contact faces 16 and over the surface of the insulator disk11 in which, those contact faces are embedded at equally-spaced inter211s. and by these several contacts the plunger 24 will close a circuit,through cacl face 1(3 as itengag'es the same.

The stud 23 also serves as a pinllc for a rock-framewhich lattercomprises two flat bars 26 and a cross-bar 27 which connects said flatbars. This frame is mounted on the stud 22 so. that its opposite endsmay rock and one end of the frame carries a contact roller 28, whichfree to revolve with respect tOSfllClfl'lIlllG. while the opp citeend ofsaid frame carries a weight l. which latter substantially counlerlialanees-the roller.

This connterbalancine of the two ends of the frame at ()PPOSlfP sides ofthe pivotstud Q3 of a decided advantage because when the rotor isrevolved the centrifugal force set up would swing the roller end of theframe outwardly whereas it is desired lo keep the roller pressedinwardly so it can roll over the curved contact faces 17 of the severalcontacts which .a re arranged aboutqlhe annular flange 15 of theinsulation disk.

Ry therefore providing lhc, weight 39 at th end of. the frame oppositelo the roller end. said two ends on opposite sides of the stud pivot 23,will both be subject to the centrifugal force set, up and one end willsubstantially counterbalance the other.

In operation, however, it is desired that the roller-"28 be kept-pressedinwardly so as to engage the curved faces 17 of the confacts and tomakethis certain under all lilll llll iin

conditions of speed-rotation, a spring 30 is coiled about the stud 23,and has one end engaged by a pin 31 on the rotor disk 21, while theother end 32 of this spring extends under the weight 29, so as to exertan outward pressure on that end of the frame and thereby swing theopposite roller-end of the frame inwardly to keep the roller 28 inagainst the annular flange 15.

When the rotor is in place on the shaft 9 and the timer casing is placedthereover, the disk 21, as shown in Fi l and 3 will have its plain side(the Si opposite that on which the rock-frame is mounted) facing theengine case so that any oil that might flow outwardly along the shaft 9will be directed laterally over the disk and then thrown from theperiphery of said disk against the annular wall 10 of the timercasingand may then flow down along said wall and escape at the bottom througha small hole 33.

From the foregoing explanation it will be seen that our improved timerprovides double contact-faces for each stationary contact and alsoprovides two rotor contacts one of which will enga e one face of acontact while the other wi l engage the other face of the same contactso that a two-point contact is made each time the circuit is closed anda failure to close the circuit at either of those two points of contactwill not affect the ignition circuit so long as a closure is effected ateither of those contact points. I

Having claim,

1. In a timer "the combination with a casing having a plurality ofstationary contacts each of which has two contact faces, of a rotorhaving a rock-frame, a contact carried by said rock-frame means forholding the rock-frame and its contact against outward movement undercentrifugal force said rock-frame contact engaging one face of astationary contact, and a second rotor contact to engage the other faceof the same stationary contact.

2. In a timer the combination with a casing having a plurality ofstationary contacts each of which has two contact faces. of a rotor diskin said casing, a contact device carried by the disk to engage one faceof each stationary contact, a rockdescribed our invention, we

frame also carried by the disk, a contact 2 device on one side of thepivot of the rockframe to engage the other face of each stationarycontact, and means on the other side of the pivot of said rock-frame tosubstantially balance the same against outward movement undercentrifugal force.

In testimony whereof we affix our signatures.

ABRAHAM s. GOLDSTEIN. ALEXIS P. DAVIS.

